PDO MySQL: Use mysqlnd column names

mysqlnd already creates interned zend_strings for us, so let's
make use of them.

This also required updating the PDO case changing code to work
with potentially shared strings. For the lowercasing, use the
optimized zend_string_tolower() implementation.

1 files changed, 4 insertions, 0 deletions

diff --git a/ext/pdo_mysql/mysql_statement.c b/ext/pdo_mysql/mysql_statement.c
index 871b7f9c7c..180a4616ef 100644
--- a/ext/pdo_mysql/mysql_statement.c
+++ b/ext/pdo_mysql/mysql_statement.c
@@ -619,7 +619,11 @@ static int pdo_mysql_stmt_describe(pdo_stmt_t *stmt, int colno) /* {{{ */
 		if (S->H->fetch_table_names) {
 			cols[i].name = strpprintf(0, "%s.%s", S->fields[i].table, S->fields[i].name);
 		} else {
+#ifdef PDO_USE_MYSQLND
+			cols[i].name = zend_string_copy(S->fields[i].sname);
+#else
 			cols[i].name = zend_string_init(S->fields[i].name, S->fields[i].name_length, 0);
+#endif
 		}
 
 		cols[i].precision = S->fields[i].decimals;